# Relationship history for MSHA mine 0103507

Current hierarchy: **Michael  Hollingshead → SRM Materials, LLC → Jackson Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Michael  Hollingshead et al → Jackson Quarry; 2013-12-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gulf Coast Sand and Gravel, LLC → Jackson Quarry; 2017-04-01 to 2020-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Duane  Donner et al → Jackson Quarry; 2017-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duane  Donner et al → Gulf Coast Sand and Gravel, LLC; 2017-04-01 to 2020-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Holmes et al → Gulf Coast Sand and Gravel, LLC; 2017-04-01 to 2020-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Bayou Materials → Jackson Quarry; 2020-02-18 to 2020-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Holmes et al → Jackson Quarry; 2020-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Holmes et al → Bayou Materials; 2020-02-18 to 2020-11-18; source msha-controller-operator-history
- **controller_controls_operator:** James S  Dasovich et al → Bayou Materials; 2020-02-18 to 2020-11-18; source msha-controller-operator-history
- **operator_operates_mine:** SRM Materials, LLC → Jackson Quarry; 2020-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Hollingshead et al → SRM Materials, LLC; 2020-11-19 to current/open; source msha-controller-operator-history